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evaluate the trigonometry function using its period as an aid cos(-7pi/3)

  • trig -

    7/3 = 2 1/3
    2 pi is a full circle
    so we have gone around clockwise two circles and pi/3
    so we really want cos (-pi/3)
    draw a picture of that,60 degrees below the x axis in quadrant 4
    the cosine is cos -60 degrees which is 1/2

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